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In practice, the complete shape of any ChronostratigraphicUnit and ChronostratigraphicBoundary instance will not be precisely known, so while the existence of a unit and its boundaries is a fact, they will never be fully described. Both ChronostratigraphicBoundary and LithostratigraphicBoundary are kinds of StratigraphicBoundary. Similarly, a ChronostratigraphicBoundary is the (notional) compound surface marking the upper or lower bound of a unit. Both ChronostratigraphicUnit and the commonly used LithostratigraphicUnit are kinds of GeologicUnit. In this context, a rigorous characterization of the relationships between the elements of the time scale, the evidence in the geologic record, and the application of specific procedures to effect numeric calibration of the scale is essential.Ī ChronostratigraphicUnit is the (notional) feature composed of all the rocks formed during the associated GeochronologicEra. Other residues of earlier practice remain visible in the description of the time scale, particularly where agreement on the application of current practices is incomplete. Nevertheless, the time scale itself remains based on named units and eras. There have been significant changes in best practice, in particular in the shift from characterizing units to defining the boundaries between them.
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This is important, since although stratigraphic methodology is one of the most rigorously studied aspects of geological practice, it has evolved throughout the era of historical geology. A formal notation is used so as to provide a rigorous description of the various elements required to describe the structure and calibration of the time scale in a manner that allows the logical consistency of the model to be evaluated. The goal of this paper is to provide an information model for the geologic time scale. The UML platform also supports a direct mapping to an eXtensible Markup Language (XML)–based file format, which may be used for the exchange of stratigraphic information using Web-service interfaces. The use of a formal notation enforces precise definition of the relationships between the components. The model builds on existing components from standardization of geospatial information systems. Here, we present a formal representation of the model using the Unified Modeling Language (UML). However, this has been primarily described in text. The International Union of Geological Sciences' International Commission on Stratigraphy guidelines recommends a very precise usage of the relationships between these components in order to establish a standard time scale for use in global correlations. The geologic time scale is a complex data structure composed of abstract elements that represent time intervals and instants and their relationships with specific concrete representations in the geologic record as well as the observations made of those concrete representations.